Pigmented paint formulation with a phosphorus acid functionalized latex binder and an associative thickener

Patent metadata

Field	Value
Publication number	US-9745492-B2
Application number	US-201615262566-A
Country	US
Kind code	B2
Filing date	Sep 12, 2016
Priority date	Sep 17, 2015
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

The present invention relates to a composition comprising an aqueous dispersion of an associative thickener having a hydrophobic portion with a calculated log P in the range of from 2.7 to 4.8; and composite particles comprising phosphorus acid functionalized polymer particles adsorbed to the surfaces of TiO 2 particles. The composition of the present invention provides formulators with flexibility in their use of low and mid shear rate thickeners to balance paint performance properties.

First claim

The invention claimed is:

1. A composition comprising an aqueous dispersion of a) from 0.02 to 2 weight percent, based on the weight of the composition, of an associative thickener having a hydrophobic portion with a calculated log P in the range of from 2.7 to 4.8; and b) from 5 to 60 weight percent, based on the weight of the composition, of composite particles comprising phosphorus acid functionalized polymer particles adsorbed to the surfaces of TiO 2 particles; wherein the volume solids content of the composition is in the range of from 30 to 44 volume percent, with the proviso that when the volume solids content is in the range of from 30 to 36 volume percent, the calculated log P of the hydrophobic portion of the associative thickener is in the range of from 4.0 to 4.8.

2. The composition of claim 1 wherein the associative thickener comprises a polyether which is a hydrophobically modified ethylene oxide urethane polymer having hydrophobic portion that is represented by the following structure:

wherein X is O or NR 2 ′ with the proviso that
X is O and R 1 is —H 12 MDI— when R 2 is CH 3 (CH 2 ) 3 — or CH 3 (CH 2 ) 2 —; or
X is O and R 1 is —IPDI— when R 2 is CH 3 (CH 2 ) 5 — or CH 3 (CH 2 ) 4 — or CH 3 (CH 2 ) 3 or benzyl; or
X is O and R 1 is —HDI— when R 2 is CH 3 (CH 2 ) 7 — or CH 3 (CH 2 ) 6 — or CH 3 (CH 2 ) 5 — or CH 3 (CH 2 ) 4 —; or
X is NR 2 ′ and R 1 is —H 12 MDI— when R 2 is benzyl and R 2 ′ is CH 3 —; or
X is NR 2 ′ and R 1 is —H 12 MDI— when R 2 is cyclohexyl and R 2 ′ is H; or
X is NR 2 ′ and R 1 is —HDI— when R 2 and R 2 ′ are each benzyl, cyclohexyl, CH 3 (CH 2 ) 3 —, or
CH 3 (CH 2 ) 4 —; or
X is NR 2 ′ and R 1 is —HDI— when R 2 is CH 3 (CH 2 ) 5 —, CH 3 (CH 2 ) 6 —, or CH 3 (CH 2 ) 7 — and R 2 ′ is H; or
X is NR 2 ′ and R 1 is —IPDI— when R 2 is CH 3 (CH 2 ) 5 — and R 2 ′ is H; or
X is NR 2 ′ and R 1 is when R 2 and R 2 ′ are CH 3 (CH 2 ) 3 —.

3. The composition of claim 1 wherein the associative thickener has a hydrophobic portion represented by

where R 3 is n-undecyl, n-decyl, n-nonyl, n-octyl, 2-ethylhexyl, 3,5,5-trimethylhexyl, 3,7-dimethyloctyl, dibenzylaminoethyl, 2-propylheptyl, diamylaminoethyl, n-octylphenyl, or 2,6-dimethylheptyl.

4. The composition of claim 1 wherein the associative thickener has a hydrophobic portion with a calculated log P in the range of from 4.2 to 4.6.

5. The composition of claim 4 wherein the associative thickener comprises a polyether which is a hydrophobically modified ethylene oxide urethane polymer having hydrophobic portion that is represented by the following structure:

wherein X is O or NR 2 ′ with the proviso that
X is O and R 1 is —IPDI— when R 2 is CH 3 (CH 2 ) 4 —; or
X is O and R 1 is —HDI— when R 2 is CH 3 (CH 2 ) 7 —; or
X is NR 2 ′ and R 1 is —H 12 MDI— when R 2 is benzyl and R 2 ′ is CH 3 —; or
X is NR 2 ′ and R 1 is when R 2 is CH 3 (CH 2 ) 5 — and R 2 ′ is H.

6. The composition of claim 3 wherein R 3 is undecyl or n-octylphenyl.

7. The composition of claim 1 which comprises, based on the weight of the composition, from 0.1 to 1 weight percent of the associative thickener and from 20 to 40 weight percent of the composite particles comprising phosphorus acid functionalized polymer particles adsorbed to the surfaces of TiO 2 particles, wherein polymer particles comprise a) from 0.5 to 15 weight percent, based on the weight of the polymer particles, of structural units of a phosphorus acid monomer; b) from 0.2 to 10 weight percent structural units of a a carboxylic acid monomer or a sulfur acid monomer or salts thereof or combinations thereof; and c) from 50 to 95 weight percent structural units of i) methyl methacrylate or styrene or a combination thereof; and ii) ethyl acrylate, butyl acrylate, or 2-ethylhexyl acrylate or a combination thereof.

Assignees

• Rohm & Haas

Inventors

• Bohling James C
• Brownell Arnold S
• Guo Jihui
• Henderson Kevin J
• Killian Ericka Lynn
• Rabasco John J
• Saucy Daniel A
• Stracke Jordan

Classifications

• C09D143/02 Primary

  Homopolymers or copolymers of monomers containing phosphorus · CPC title

• C09D7/43

  Thickening agents · CPC title

• C09D5/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• C09D7/61

  inorganic · CPC title

• C09D133/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title